Heat exchanger



J. R. WILSON HEAT EXCHANGER June 17, 1952 2 Sl-lEETS-SHEET 1 Filed Jan. 13, 1950 M HUME- NNHHHHHHHUIMH IN V EN TOR.

m S n w w R R n w M A w 6 ma Y I i Jime 17, 1952 JQR. WILSON HEAT EXCHANGER 2 SHEETS-SHEET 2 Filed Jan. 15 1950 INVENTOR. John R. Wilson BY WM M flaw HIS ATTORNEYS Patented June 17, 1952 HEAT EXCHANGER John R. Wilson, Penn Township, Allegheny County, Pa., assignor to Hanlon & Wilson Company, Wilkinsburg, Pa., a corporation of Pennsylvania Application January 13, 1950, Serial No. 138,298

2 Claims.

This invention relates to heat exchangers. Although the invention may be'used for other purposes, it is described herein as applied to a heat exchanger in which the hot exhaust gases of an airplane engine are used for heating air, the

heated air being employed for preventing icing of the wings of an airplane.

In the accompanying drawings which" illustrate a preferred embodiment of the invention:

Figure l is a side elevation of the heat exchanger;

Figure 2A and 2B when taken together constitute a vertical longitudinal section through the heat exchanger, taken on the line IIII of Figure 3, these figures being on a larger scale than Figure 1; I

Figure 3 is an end elevation taken on the line III--III of Figure l but to a larger scale;

Figure 4 is a vertical transverse section taken on the line IV-IV of Figure l but on a larger scale; and

Figure 5 is a vertical transverse section taken on the line VV of Figure 1 but on a larger scale.

Referring more particularly to the accompanying drawings, the heat exchanger comprises a shroud or casing indicated generally by the reference numeral I and made up of sections la, lb, lo and id assembled in end to end relationship. A slip joint 2 is provided between the sections la and lb and a welded joint 2a is provided between section lb and lo. The shroud is cylindrical in cross-section, as shown in Figures 4 and 5. A core, indicated generally by the reference numeral 3, is located inside of and spaced from the shroud l to form an outer passage 4 for air or other fluid to be heated, as hereinafter explained. The shroud l is supported on the core 3 by pins 5 which are welded to the core at their inner ends and which slidably support the shroud at their outer ends. These pins are grouped in circles which are spaced longitudinally of the core.

An inner tube indicated generally by the reference numeral 6 is located inside of and spaced from the core 3. It is made up of sections 6a and 6b having a slip joint 1 between these sections. The inner tube 6 is supported from the core 3 by tubes 8 which are welded at their inner ends to the inner tube 6 and at their outer ends are welded to feet 9 which float against wear pads on the core 3. In the illustrated embodiment of the invention the tubes 8 are used in groups of three tubes, the groups being spaced longitudinally of the heat exchanger.

Longitudinally extending walls Ill divide the outer passage 1 formed by the shroud l andthe core 3 into a plurality of longitudinally extending outer passages ll, l2, Halt, l5 and I6, as shown in Figure 4. Each of the passages ll, l3 and I5 is blocked oii intermediate its ends by a transversely extending wall ll, as shown in Figure 2A. Three conduits l8 are connected at their inner ends l9 to the forward end of the inner tube 6. The outer end 20 of each conduit is connected to the core 3 by a weld designated by the reference numeral 2|, the weld being located on the outside surface of the core 3 so that the weld is located in the outer passage 4.

Air to be heated enters an air inlet 23 and flows through a curved passage 2t into the heat exchanger. The inlet faces forwardly of the airplane so that when the plane is in motion the inlet and passageway 24 act as a scoop to force air under pressure through the heat exchanger. The air passes upwardly from the passageway 24 into an annular chamber 25. A portion of the air passes from the chamber 25 through the outer passages l2, l4 and It which extend substantially the whole length of the heat exchanger. It then passes into an annular chamber 26 located at the rear end of the heat exchanger and from the chamber 26 flows into an outlet conduit 21.

Another portion of the air in the chamber 25 flows into the passageways ll, l3 and I5 and from there flows through the conduits l8 into and through the inner tube 6. This portion then flows through a conduit 28 into the outlet conduit 21.

The hot engine exhaust gases or other heating fluid enters the forward end 29 of the core 3 and then flows through the space between the core and the inner tube 6 and leaves the heat exchanger at the end 30 of the core. In the drawings the flow of air or other fluid to be heated is designated by the double tailed arrows and the flow of exhaust gases or other heating fluid is designated by the single tailed arrows.

It will be seen that in my heat exchanger fluid to be heated flows through outer passages l2, l4 and Hi, and also through an inner passage formed by the inner tube 6, while the heating fluid flows through an intermediate passage which is located between the inner tube 6 and the core 3. Thus the heating fluid is surrounded on both its outside and its inside with fluid to be heated and this arrangement provides very effective heat transfer. The inner tube 6 also causes the heating fluid to be forced against the core 3, thereby providing good heat transfer between the core 3 and the air flowing through the outer passages l2, l4 and I6.

The invention is not limited to the preferred embodiment; but may be otherwise embodied or practiced within the scope of the followin claims.

I claim:

1. A heat exchanger comprising a shroud, a hollow core located inside and spaced from said shroud to form an outer passage between said shroud and core and having an inlet and an outlet, an inner tube located inside and spaced from said core throughout its length and havin an inlet and an outlet, conduits connecting'said outer passage and said inner tube, said conduits being welded to said core with the welds located in said outer passage, means for flowing a first portion of the fluid to be heated through a part of said outer passage adjacent said welds "and then through said conduits and then through said inner tube, means for flowing a second portion of the fluid to be heated through another part of said outer passage which is spaced circumferentially from the part of'said outer passage through which said first portion flows, and means for flowing heating fluid through the space between said inner tube and said corel W 2. n heat exchanger coinprising a shroud, a hollow core located inside and spaced from :said shroud to'iorm' an outer passage having an inlet and an outletf-longitudinally extendingwalls dividing the space between's'aid shroud and "car into a plurality of separate longitudinally extending outer passages, some of said outer passages being blocked off intermediate their ends and others being open between their ends, an inner tube located inside and spaced from said core and having an inlet and an outlet, conduits connecting said inner tube with those outer passages which are blocked oil, means for flowing a portion of the fluid to be heated through the forward parts of said blocked ofi outer passages and then through said conduits and then through said inner tube, means for flowing another portion of the fluid to be heated through said outer open passages, and means for flowing heating fluid thr space between said inner tube and said core.

JOHN R. WILSON.

REFERENCES CITED T tollewi reisren ss a e 9? ss ri .1. t 1? o t i patent TA'IES I ATEN Number Name Date 269,873 Michael Jan. 2, 1883 505,697 Bridges Sept. 26, 1893 766,190 Loehr Aug. 2, 190.4 853,153 Berger May 7, 1907 1,148,726 Thompson Aug. 3, 1915 1,600,219 Eulberg Sept. 21, 1926 1,920,059 Buschbaum July 25, 1933 2,482,987 McCollum Sept. 27, 1949 

